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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e61fbe600085ad8c69f24550202d2f81801070e4487f2b99433fa9f224f114c2' 
  AND token = 'Bzas2fz9WuSs502cLrVTdM71D1WgKuMUyNEkXNLzHHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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