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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '076cfd137e1cd6e357d0971b6a671b4b3a4da3fb25afa1c615599fa6be3a9f8e' 
  AND token = 'OeoYL8ZGQEKu2TVWD3NPhDWugtYHJg8g3RaWpdPChlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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