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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab21344bd08abbb041567743efd4e8e523ce11040fc86fdad91a8cb858f1cfda' 
  AND token = '3KpW4hsdozZgymeU9J/9Sx9MXYDA4cswvnFnm5Tqgss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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