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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b56c04415b8f888fb89869c860a2d1b4453497972fda012e3a1bdbe9a51e9f8e' 
  AND token = 'Llyiswa2w0xuFr/G7QZyPBpxhMuciQCG8OwCLJvi46M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}