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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa6c61b53460415ad75db3abb77c2db97476152a69e8bbccca6fe8733b427fd4' 
  AND token = 'OLACqSb3HvuaDBT3sEDsduEIB2imuJ6yvk6HLGHlYs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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