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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ac975e6c31f91a7959d4b68bedbb41d34b30324d08a1f1a231e09e9d75a2e3a' 
  AND token = 'aRbpds7MWcy8jmls6s1GFv3emQDQQiXMZbJp5i1qlLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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