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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '158fa66ae68e0e08134fc91e1dac153ae270ef1447c07b7a6652d35842f97784' 
  AND token = 'tbczUpb8au5sPx8TFSIQlF7mCrlVJ+JhAl/BC4orX2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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