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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4db280bb25c225f9f2ee3bfb984ca7890e806314ee83a9f90442b857df9918a' 
  AND token = 'x4+5ybDJ46I05gkSWJFC7gUqZDkioSqRvu1e2Ft48AI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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