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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7579949b051269e3c06b4c83754b9bf1805a3a6adedc675dd8423c00b496aa93' 
  AND token = 'wdd6Td1/FuXOtdFCL2WQEuWk9ag40WPe68a6lyltaOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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