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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd942c3aad1f5414d886b681c61ad84ea766894d2fee314d734e03d81e3e060f' 
  AND token = 'IBWIj3FybytT3fse4eJbI60uksXvCBLmu8/5O1ZhTRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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