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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf4b314fe2e33cab27ed360972557efe6086dc34555fa4b2d75340cc76fc054d' 
  AND token = 'TYSeK9zoa6iMB2lDA0aokO8C02dkcd+C7euSXzUGju4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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