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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91ee325a5c331d25001efe498d4bf11a0243d7001e8bde036ff7549172ee3662' 
  AND token = 'wQpH2d5rt9QffBwQjMmXo6qfdfKIcqliVI3ZucfnQLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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