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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5372b6cf7ead7b7eb86d11213657652e0689cf29f2b2a8cd96d9de009a824c85' 
  AND token = 'CYzZKezJiAqTBdW08Bu1Z5Cru3rnk0Sr60oEFwYGRO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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