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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdbaf612dea3e9565cf8b074dd798f5d428c88d2b8941f98df1a3b9183b6bb07' 
  AND token = 'vvICS8ZgPtpHGthU/KGclgD6w9TdgQ4DD4100Hi6/GE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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