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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeb5e15f2401c385e20e9113d1e84aa774688e0564018a08e1019eced604c4d6' 
  AND token = 'axdppFfsuZ/hCFlTiCbUwPoWeK4dQcNtdFX5Kaf5vDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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