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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '181076398686f992a0096881c88bd1318c6d6c155e90d7bafcd698bd2633559c' 
  AND token = 'WiBZrRReoTmPkgyP+Zc8vugzo04kZa5jwRhQOsoIgK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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