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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '974d3df5fb28eaf0ad9456f670f73b58140f8ee46a038a34995616205d25f4ba' 
  AND token = '8e0E90SL2dF5wod0wVkz2KwKExuGNyEZVxw/vgbLzLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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