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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f6f4ed96175ec0eea723f778bb7fe196e5ca5c8e4727e880047b3becdef763f' 
  AND token = 'CFIZiOtXJJXtpGDq9HKw8157lx/ECyQC8G2StnKTkzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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