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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6214f92c2e154a94cdfd69e847a1972522d5903e9163c4f0de7128233b90c7b2' 
  AND token = 'D4TgkAbo2XpG0i3rLeDh8lGts5f+IzoWyEz1XJViDeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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