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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '153a80516ff9b49763e33a0c66889bfd9fab3fef669145b9c624369dbbb6ac9d' 
  AND token = 'oZa5I+HbR6Lp6n1gOJF70yJK823tFHggvmFatUfAA1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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