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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c088aeae53a456a662b16c61e57e3e9ac8e86372ed3e0df95eb86abd1d72cf84' 
  AND token = '0nyf6/szuGy41YIeuuWciqVlTHNu5unYVLKxmo0kGaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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