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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fe718a454de3b75878669117de6da5f32597711111fcebda6df746c548ff2f8' 
  AND token = 'cfVtJICNH5zQEarU2Z8ezAdDdGPXcDc5WG2Aqaj3IrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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