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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c736f7e7fe30e3b5b3e9da689af463644eaa00998f712634f16ac4ab7eb32082' 
  AND token = 'gu5BscRbe8BPXHns5HcAKKEJwodPRbow0d4vene7Z6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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