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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b0a202d6a7f7f4bb2c5ca514afbd06e24521a9969524895acae6c70011f5bcb' 
  AND token = '8rJ5XRfNZdKR88UnvBHIVyKTq4ceSuStU6Kdpt5Mxf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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