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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9c772cc614f3fb6757a784e64ae6c7c78cb33cab8a16ecf2a96d828b1bd810c' 
  AND token = 'Apr6lDff50bPzYJlbHGb64ERvhvE9S7DAepoVUyttJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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