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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b26b2e5b909fac22b65bbf2bc4a9e2874b9bedb35d48b987ad2f8170d77dc145' 
  AND token = '6vuW4MPHBrOBpXZv5WHL1HQQVjq/s58kLwsNftD8pkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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