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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92cf7c188185a3853e919c7bb43a07f7d0e5b1ae4ab874abad13e19ec6b0928f' 
  AND token = 'q2PCPWhx1aBED+RPdd2z4LPXVOpP+20vfSVKf7SUoeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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