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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '393a67743dfbe7159ab9a8e3018fd8c2cb7d2df9b6077c51cdd6efc9273a2061' 
  AND token = 'xb3TyCmgb7MOSqs6A9hyxT61OmO2x9ZsX+iZNaReiUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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