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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '083ceeb7db30ff1c8a943c284783bbd6bd38d698b5ee4256fa187f443fa6555c' 
  AND token = 'cLEcCuLAXhbNRhvMEj4x7WV/PJIsKKUN5DkCIonA4NE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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