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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2d074b3c3f2f362c8d344ea6942fd740c2a9fea41945c6cd63f440fa78bdb36' 
  AND token = 'fMDfKTe8bBnwR/fV4LsBhzLDLkf+126Dekf4HrVysSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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