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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '092b872457b8aa0e083def4cf17f31539a0d32003cab90373f3be0ca3de2d2e1' 
  AND token = 'xjM11vBlJ5FU8Pl8tKrsvpMT2r45cqx0N7Ix18N0T8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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