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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e74dc5b954878d450e629be11543f12c410e17ac9f86bda1b92f006bec54eba2' 
  AND token = 'C1VA/6f7atloe1xmYE7uW27Uhgw9RzHsohom7I2DwMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00088

JSON explain

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