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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4daa5621e7fcaaedfb5e3731da4a9f7a9c31df2b4ca0c4f5b8e2e1b393ded28' 
  AND token = 'Bb3ageaMTFmUgxCAjX5Z3lOneMpuZxD8CtH3hGwiCq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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