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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f41573853a737e979d4749138d1859680d7651a0b3270a7990f3868f4a8496a9' 
  AND token = 'amSfPREfKDViS7hv6GwLNJhZWUtgrzY93qdaf9jkPwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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