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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d06f8e5ff1d50b3cc17a2ab581c57f5cae3823de4cb68102affebc81ecbdb90' 
  AND token = 'xKteP0D6mC6xYc/Z5XrXU8M2tOWopfSFT3ogIv0KKAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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