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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '848bc603a58ddee5dec95ce4a7a0cd4ace3f4becfb0076d698e5481eb1211d92' 
  AND token = 'u19Z/nMCimFhSxq3yhc1SG76lErOAo26U84gdfelIgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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