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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98c0efde726fc70ed4fa0d91a956be33dcd5337b36b9a9e2b4f804270b3e3300' 
  AND token = 'JZ/Uxlv8GU3sVkBAIVMd/Bq0uknpd8gmm2rbeEQbvZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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