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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d40962e560c749432afb0c151526a45ea57d095e0de7c87a306b9df3bd97ed6' 
  AND token = '35qJFk70VJq//4uFSNeLen+v8v0UDKHWNtLg/9TQbgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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