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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8007323d1b1637c96f912404e00d840ce34e1aacc688195e85f17b7740ae5534' 
  AND token = '1lKTX2eshRYdo61Q67R1DUbfXI1hr+4dhc2lMKvxfmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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