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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c070d9e2c8d96e1b93fade5e09e4f34747ef3ada668644dbbd8658795c69956' 
  AND token = 'f4ZeyOjEhnb63YQBYA3Gs+Z8V+yCK8yPfu4g2YC2vOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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