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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43830b8b43d8356ff746fd3378a9ba092e589204bb5d0f3d893b0e8960442ce8' 
  AND token = 'ZDpXhu54AdFv8z4piDL0f2ahU1rNv0PaZXU4ODEp+uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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