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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e80a6d88bf299365360aed7ee44554765c3a8adcb766fa7e8d36a9a326b6b2c' 
  AND token = 'O4mF88cir7tpb66MwrcXN9bIS1akBlTl8ypJVeX3kmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00102

JSON explain

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