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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c77e870cc9652f07bb86b3a1dc40e7a080592032fdd4c8e2fcef98aa546d6bd2' 
  AND token = 'yycWFcw9PSVI1LQonvhpWvHIgHLIuB4+FMyJoIYgD0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00101

JSON explain

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