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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e691db5259e979a3f94d06f8487f68f1fb232fb78d4d82ac70c6fc6dc7465fe' 
  AND token = 'rWXsy0UWj9fu27DfvOEX3wpwFUE4zxGO59xEF7SYviM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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