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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd907371f179d187aab576536497bfdde08f7acd0b5d31f3f5ba0e30fcc0341ed' 
  AND token = '7Y8sgY2b7L+fW+MqyNbVRz+lF/r26BXVC0KA4PGWt6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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