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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d6051586049d97695b769ede92d10ff6801c918a451fb6864c95423749b7e65' 
  AND token = 'oZtIp2G+kSlhlMtoQnj7s9o3SI5Qqm4b6J8jn3T/nkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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