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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ab31c641d402f4403b21e145f82f2c24f8b9c13edf1ec32ae6569d3290530a6' 
  AND token = 'oY/6OHkt/eLrd52jZB3Unqp44GIrvP4P9u9t9bIf6Q0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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