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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08a7d7355d744cd5d285cee9fd247b276d6206e865ab167649315ba60ec3b43e' 
  AND token = 'uhTEeFI8QxgKlieoP6GTVQPKn5sCXs6PWE50MGU2lhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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