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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6e9d0ef11f0dd31e56a2bc824eda266561530a42cfba159d0e9e639829ded85' 
  AND token = 'mFKXYX2SFrfWDsChy6e0G0+YJk94R9ApI6ryB/C0dsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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