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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3be49c95e59d6b3f27491b117e4f861aede7f5e2c2bcf13600fc7ae582aac2dd' 
  AND token = 'fsji2kx1xN1OschxgXWO7kFc7AoDMn1Z2wwl7unMX6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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