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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea474130dd59236f5c86bafa2338535cb3af3dc6d895ced57f323d0d1bcd0450' 
  AND token = '/eIZdwCy/seeGkiK5k7gRTEdG+k48Pd7Od946ElOiVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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