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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52bb6d41eb120118abc89edd1cad2253e049a35c983e299c3ecad749b86e0343' 
  AND token = 'AlAxVdKyPNyvlOGJvkphpXU3AsGBdHy0pwvCmQpdFxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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