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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc521c1354a3979a8018861410803df680e57b8c74bbc674de881e5921c31b95' 
  AND token = '/PKbSIycYWpeFza5cZygVYZ5DlMhPr3zRJ13li6xwCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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