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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01eec519f9c0018426356466ac68df6438fb5a1e3d305927a7b69b3cab0fdf56' 
  AND token = 'ndNoFZIAzBd7wbYHefGjsI4luSInO+LVHaikc6+exkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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