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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8638ce96702302fd5df5d1c2ac74743d4b0db06a47dd912990bdc60071f11669' 
  AND token = '1XxMTMWhmGzuQqDExmzayL0YkV2iA7Kzvhy6/AAiV5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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