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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a0af371b1d24563bf2336726bf3ca188e5ebc9dccb1d3bee79aaa506e2c8fb1' 
  AND token = 'OqsG9bRJcdMbt7m1ZJianIk9mojZDnbrlUccYCYUeOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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