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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '136d7ea0a611e7609001fff7dfe6a5c77afbc3195496e0612fbcf35c0ef4e811' 
  AND token = 'TV+bToTSWjXQcOr/s+3lnv/LcQU1ix2yL5M7cHvM2nQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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