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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8df4eb0141cd9f757d7edf9cd3d61c2f5114852c118ddc17ec09ed7f0fe04abe' 
  AND token = 'ZUsgEfqPAPEAU5bXlazQ0iePr+m7w+THYlWtxUzZf80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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